I have no idea what #1 means. Are you worried that someone will build an A bomb out of a car?
If you are so paranoid that you believe that anything with a computer can be hacked, you should worry about other shit than autonomous cars.
Are you analogy challenged ? The analogy was clear enough. No need for explanation.
And of course I worry about other things than autonomous cars. I think just about everything that our computer crazy society has endangered us by putting everything reliant on computer activity. The really critical things (electrical grid, dams, traffic lights, nuclear weapons, etc) should all have non-computer back-ups (like we didOK with in the 60s)